1. spoil, ruin, break, mar. Injure,impair mean to harm or damage something. Injure is a general term referring to any kind or degree of damage: to injure one's spine; to injure one's reputation. To impair is to make imperfect in any way, often with a suggestion of progressive deterioration and of permanency in the result: One's health is impaired by overwork.2. maltreat, abuse.

injure

v.

mid-15c., "do an injustice to, dishonor," probably a back-formation from injury, or else from Middle French injuriier, from Latin injurare. Injury also served as a verb (late 15c.). Related: Injured; injuring.